Loma Prieta Mine (Commercial Mine; Copper Glance Mine; Patented claims MS 3425; Copper Hill Mine [?]; Copper Basin group [in part]), Copper Basin Mining District, Sierra Prieta Mountains, Yavapai County, Arizona, USAi
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Latitude & Longitude (WGS84):
34° 29' 23'' North , 112° 34' 58'' West
Latitude & Longitude (decimal):
Type:
KΓΆppen climate type:
Nearest Settlements:
Place | Population | Distance |
---|---|---|
Wilhoit | 868 (2011) | 7.1km |
Prescott | 41,899 (2017) | 11.9km |
Williamson | 5,438 (2011) | 22.6km |
Peeples Valley | 428 (2011) | 27.9km |
Prescott Valley | 42,197 (2017) | 27.9km |
Nearest Clubs:
Local clubs are the best way to get access to collecting localities
Local clubs are the best way to get access to collecting localities
Club | Location | Distance |
---|---|---|
Prescott Gem & Mineral Club | Prescott Valley, Arizona | 28km |
Mindat Locality ID:
51336
Long-form identifier:
mindat:1:2:51336:7
GUID (UUID V4):
8c41a000-31c7-4f50-9ba5-ba1b3c9d863d
A former underground Cu-Ag-Au-Pb-Mo-Zn mine located on the boundary of secs. 20 & 21 (in the SWΒΌ sec. 21), T.13N., R.3W., Β½ mile east of the Copper Hill deposit (Wilhoit 7.5 minute topo map). Discovered in 1885 by Dan O'Carroll. Owned by Mrs. Sophia Smoot, Prescott (1943); and, the Loma Prieta Mines Co. (1916-1918 timeframe). Owned by the Phelps Dodge Corp., and under lease to F.S. Schemmer (circa 1943). Discovered 1890. Produced 1906-1968 and produced 1917-1918. Consists of patented claims: 485, 486, 487, 488, 489, 491, 510, 511, 512, 513, 514, 515, 516, and 518. Claims extend into the SEΒΌSEΒΌSEΒΌ of sec. 17, SΒ½SWΒΌ of sec. 16, the NΒ½ of sec. 28, and the NΒ½NEΒΌNEΒΌ of sec. 29 & 21. Claims extend into RRC 59B.
Mineralization is a breccia pipe about 600 feet in diameter at the surface with a pipe-like, cylindrical, vertical ore body. Ore control was ore localized in breccia pipes and along late stage dikes along with disseminated ore. Alteration was sericitization and argillization. Ore concentration was oxidation and enrichment at near surface. Alteration was seritization and clay. An associated rock unit is the Copper Basin Stock.
Area structures include the Copper Basin Stock elongate NNE-SSW, faults N20-26W and N20-30E. Foliation in Precambrian rocks = N20E to N20W, with a steep dip west. Breccia around older quartz latite porphyry. The prevailing rock is fine- to medium-grained quartz diorite, deeply weathered in part and locally mineralized along joints with pyrite. Dikes of rhyolite and quartz diorite porphyry intrude the quartz diorite.
In the vicinity of the mine the quartz diorite has been brecciated, altered by hydrothermal activity, and cemented by quartz containing sulfide minerals, which are oxidized at the surface to limonite. The general elliptical horizontal outline of the breccia and the heterogeneity indicate that the mineralized breccia is part of a breccia pipe 250 feet in diameter.
The quartz cementing the breccia fragments is of two types. The more common type is white, contains coarse feldspar crystals, and has vugs lined with dolomite. The less common type of cementing quartz is dense and flinty, and its fuzzy margins against the quartz diorite suggest some replacement of the fragments. In both types of quartz sulfide minerals, pyrite and chalcopyrite, form coarse blobs and bunches that are generally confined to the center of the cementing veins. Molybdenite finely divided and forms narrow veinlets either at the margin of the veins or crosscutting the quartz. In a few places, the quartz veins are brecciated and cemented by younger, finely-divided molybdenite.
Development work occurred during the period 1916-18. The underground workings comprise the 46, 75, 150, and 400 levels and a vertical shaft 414 feet deep. Workings include shafts, adits, drifts and crosscuts, all within limits of the breccia pipe. Incomplete production records to 1955 show that more than 150,000 tons of high-silica copper ore was produced.
Select Mineral List Type
Standard Detailed Gallery Strunz Chemical ElementsDetailed Mineral List:
β Azurite Formula: Cu3(CO3)2(OH)2 |
β Bornite Formula: Cu5FeS4 |
β Calcite Formula: CaCO3 |
β Chalcocite Formula: Cu2S |
β Chalcopyrite Formula: CuFeS2 Description: Blobs & bunches in quartz. |
β Chrysocolla Formula: Cu2-xAlx(H2-xSi2O5)(OH)4 · nH2O, x < 1 |
β Copper Formula: Cu |
β Cuprite Formula: Cu2O |
β Dolomite Formula: CaMg(CO3)2 Description: Lining cavities in white quartz. |
β 'Feldspar Group' Description: Coarse crystals in white quartz. |
β Ferrimolybdite Formula: Fe2(MoO4)3 · nH2O |
β Hematite Formula: Fe2O3 |
β Jarosite Formula: KFe3+3(SO4)2(OH)6 |
β 'Limonite' Description: Occurs in gossan capping material near surface. |
β Malachite Formula: Cu2(CO3)(OH)2 |
β Molybdenite Formula: MoS2 Description: As narrow veinlets and as cement in brecciated quartz veins. References: |
β Muscovite Formula: KAl2(AlSi3O10)(OH)2 |
β Muscovite var. Sericite Formula: KAl2(AlSi3O10)(OH)2 |
β Orthoclase Formula: K(AlSi3O8) |
β Pyrite Formula: FeS2 Description: Blobs and bunches in quartz. |
β Tenorite Formula: CuO |
Gallery:
List of minerals arranged by Strunz 10th Edition classification
Group 1 - Elements | |||
---|---|---|---|
β | Copper | 1.AA.05 | Cu |
Group 2 - Sulphides and Sulfosalts | |||
β | Chalcocite | 2.BA.05 | Cu2S |
β | Bornite | 2.BA.15 | Cu5FeS4 |
β | Chalcopyrite | 2.CB.10a | CuFeS2 |
β | Molybdenite | 2.EA.30 | MoS2 |
β | Pyrite | 2.EB.05a | FeS2 |
Group 4 - Oxides and Hydroxides | |||
β | Cuprite | 4.AA.10 | Cu2O |
β | Tenorite | 4.AB.10 | CuO |
β | Hematite | 4.CB.05 | Fe2O3 |
Group 5 - Nitrates and Carbonates | |||
β | Calcite | 5.AB.05 | CaCO3 |
β | Dolomite | 5.AB.10 | CaMg(CO3)2 |
β | Azurite | 5.BA.05 | Cu3(CO3)2(OH)2 |
β | Malachite | 5.BA.10 | Cu2(CO3)(OH)2 |
Group 7 - Sulphates, Chromates, Molybdates and Tungstates | |||
β | Jarosite | 7.BC.10 | KFe3+3(SO4)2(OH)6 |
β | Ferrimolybdite | 7.GB.30 | Fe2(MoO4)3 Β· nH2O |
Group 9 - Silicates | |||
β | Muscovite var. Sericite | 9.EC.15 | KAl2(AlSi3O10)(OH)2 |
β | 9.EC.15 | KAl2(AlSi3O10)(OH)2 | |
β | Chrysocolla | 9.ED.20 | Cu2-xAlx(H2-xSi2O5)(OH)4 Β· nH2O, x < 1 |
β | Orthoclase | 9.FA.30 | K(AlSi3O8) |
Unclassified | |||
β | 'Limonite' | - | |
β | 'Feldspar Group' | - |
List of minerals for each chemical element
H | Hydrogen | |
---|---|---|
H | β Azurite | Cu3(CO3)2(OH)2 |
H | β Chrysocolla | Cu2-xAlx(H2-xSi2O5)(OH)4 · nH2O, x < 1 |
H | β Ferrimolybdite | Fe2(MoO4)3 · nH2O |
H | β Jarosite | KFe33+(SO4)2(OH)6 |
H | β Malachite | Cu2(CO3)(OH)2 |
H | β Muscovite | KAl2(AlSi3O10)(OH)2 |
H | β Muscovite var. Sericite | KAl2(AlSi3O10)(OH)2 |
C | Carbon | |
C | β Azurite | Cu3(CO3)2(OH)2 |
C | β Calcite | CaCO3 |
C | β Dolomite | CaMg(CO3)2 |
C | β Malachite | Cu2(CO3)(OH)2 |
O | Oxygen | |
O | β Azurite | Cu3(CO3)2(OH)2 |
O | β Calcite | CaCO3 |
O | β Chrysocolla | Cu2-xAlx(H2-xSi2O5)(OH)4 · nH2O, x < 1 |
O | β Cuprite | Cu2O |
O | β Dolomite | CaMg(CO3)2 |
O | β Ferrimolybdite | Fe2(MoO4)3 · nH2O |
O | β Hematite | Fe2O3 |
O | β Jarosite | KFe33+(SO4)2(OH)6 |
O | β Malachite | Cu2(CO3)(OH)2 |
O | β Muscovite | KAl2(AlSi3O10)(OH)2 |
O | β Orthoclase | K(AlSi3O8) |
O | β Tenorite | CuO |
O | β Muscovite var. Sericite | KAl2(AlSi3O10)(OH)2 |
Mg | Magnesium | |
Mg | β Dolomite | CaMg(CO3)2 |
Al | Aluminium | |
Al | β Chrysocolla | Cu2-xAlx(H2-xSi2O5)(OH)4 · nH2O, x < 1 |
Al | β Muscovite | KAl2(AlSi3O10)(OH)2 |
Al | β Orthoclase | K(AlSi3O8) |
Al | β Muscovite var. Sericite | KAl2(AlSi3O10)(OH)2 |
Si | Silicon | |
Si | β Chrysocolla | Cu2-xAlx(H2-xSi2O5)(OH)4 · nH2O, x < 1 |
Si | β Muscovite | KAl2(AlSi3O10)(OH)2 |
Si | β Orthoclase | K(AlSi3O8) |
Si | β Muscovite var. Sericite | KAl2(AlSi3O10)(OH)2 |
S | Sulfur | |
S | β Bornite | Cu5FeS4 |
S | β Chalcopyrite | CuFeS2 |
S | β Chalcocite | Cu2S |
S | β Jarosite | KFe33+(SO4)2(OH)6 |
S | β Molybdenite | MoS2 |
S | β Pyrite | FeS2 |
K | Potassium | |
K | β Jarosite | KFe33+(SO4)2(OH)6 |
K | β Muscovite | KAl2(AlSi3O10)(OH)2 |
K | β Orthoclase | K(AlSi3O8) |
K | β Muscovite var. Sericite | KAl2(AlSi3O10)(OH)2 |
Ca | Calcium | |
Ca | β Calcite | CaCO3 |
Ca | β Dolomite | CaMg(CO3)2 |
Fe | Iron | |
Fe | β Bornite | Cu5FeS4 |
Fe | β Chalcopyrite | CuFeS2 |
Fe | β Ferrimolybdite | Fe2(MoO4)3 · nH2O |
Fe | β Hematite | Fe2O3 |
Fe | β Jarosite | KFe33+(SO4)2(OH)6 |
Fe | β Pyrite | FeS2 |
Cu | Copper | |
Cu | β Azurite | Cu3(CO3)2(OH)2 |
Cu | β Bornite | Cu5FeS4 |
Cu | β Chalcopyrite | CuFeS2 |
Cu | β Chalcocite | Cu2S |
Cu | β Chrysocolla | Cu2-xAlx(H2-xSi2O5)(OH)4 · nH2O, x < 1 |
Cu | β Cuprite | Cu2O |
Cu | β Copper | Cu |
Cu | β Malachite | Cu2(CO3)(OH)2 |
Cu | β Tenorite | CuO |
Mo | Molybdenum | |
Mo | β Ferrimolybdite | Fe2(MoO4)3 · nH2O |
Mo | β Molybdenite | MoS2 |
Other Regions, Features and Areas containing this locality
North America PlateTectonic Plate
- Basin and Range BasinsBasin
- Great Plains DomainDomain
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